<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>案例1</title>
    <style>
        td{
            border: 1px solid;
        }
    </style>
</head>
<body>
<script>
  /*
  * 九九乘法表
  * */
document.write("<table  align='center'>")
  for (var i = 1; i <=9 ; i++) {
      document.write("<tr>")
      for (var j = 1; j <=i ; j++) {
      //    输出
          document.write("<td>")
          document.write(i+"*"+j+"="+(i*j)+"&nbsp"+"&nbsp"+"&nbsp");
          document.write("</td>")
      }
  //    输出换行
      document.write("</tr>");
  }
document.write("</table>")

</script>

</body>
</html>